00710naa#a2200205#i#450# EN\INFRA-M\bibl\101511 20260406171241.1 2712-9640 20260325b2026####ek#y0engy0150####ca RU Critical level influence on spectra of secondary gravity waves in the middle and upper atmosphere Journal article Moscow INFRA-M Academic Publishing LLC. 2026 9 с. Journal article local Гравитационные волны. 551.511.31 Gavrilov Nikolay Mihaylovich Kshevetskii Sergey Petrovich Koval Andrey Vladislavovich Kurdyaeva Yulia A. zh-szf.ru